Catapillar traxcavator 955a 12a

Seems more like clutch slippage is the problem. Have you done the adjustment procedure and does it hold its adjustment?

Old Magnet
I have not done the clutch slippage procedure. Is there a thread on that? I have adjusted the clutch so it engages better. It does not slip at all until about an hour after running. Is the warming up causing clutch to slip?
thanks
joe

This is the clutch adjustment procedure. It depends on the clamps holding their adjustment. If they don't hold the clutch tends to tighten on it's own. Temperature should not have much affect on the operation except when the oil is cold which causes drag on the clutch discs with tendency for the tractor wanting to drive.

The oil pump is there to circulate oil for cooling and lubrication. Have you checked the pump suction strainer at the bottom rear of the clutch housing?

we did check that when we changed the clutch disc pads and it was clear. I have done those adjustments and the clutch is working great with no slippage until I have used the dozer for about an hour. Is there a way to check the clutch oil pump to see if it is working? I took the cover plate off to look and see if I could see it pumping but i could not tell.
thanks
joe

There really isn't a way of testing the pump in place but you should see oil flying around and movement looking down into the cavity with the cover off.

The pump has two sections, one section scavenges oil from the flywheel area (through the strainer) and dumps it to the rear of the housing behind the support bracket. It is then picked up by a suction tube to the second section of the pump and on to the clutch shaft.

Is the rear suction tube in place? The tube has been known to be broken off if someone forgets to undo the capscrew that attaches it to the bottom of the housing when pulling the clutch assembly.

What kind of oil are you running in the clutch housing?

Check the suction tube on the oil pump for cracks near the pump. Had one on a D4 that cracked from tube being bolted to bottom of trans case, too much force on tube, pump quit pushing oil through main clutch bearings and would tighten up stop and stall the tractor even. Had to remove the whole clutch and repair the main shaft and new bearings. Left tube unbolted from case, worked fine.

We are using 30 wt oil for the clutch. Is there a way to see if the oil clutch pump is not working, or should I just buy a replacement. I have someone that can sell me another one for $150 plus shipping.

Did you follow up on checking the suction tube? Pretty rare to have the pump completely fail. If you look in there while running you should at least be able to see if the gear drive is rotating the pump.